Three-dimensional video imaging device

A three-dimensional video imaging device comprising:

• a light source unit configured to irradiate a subject with infrared light;
• an imaging element unit on which reflected light of the infrared light emitted by the light source unit and reflected by the subject is incident;
• and
• a processing unit configured to perform control of the light source unit and the imaging element unit and processing of a signal output from the imaging element unit,
• wherein the imaging element unit includes
• a prism on which the infrared light from the subject is incident,
• a half mirror configured to reflect a part of the infrared light that has been incident on the prism at a reflectance of a first value and transmit a remainder of the infrared light that has been incident on the prism at a transmittance of a second value that is different from the first value,
• another prism on which the infrared light transmitted by the half mirror is incident,
• an imaging element configured to receive the infrared light transmitted at the transmittance of a smaller value out of the first value and the second value and reflected at the reflectance of a smaller value out of the first value and the second value by the half mirror, and
• another imaging element configured to receive the infrared light transmitted at the transmittance of a larger value out of the first value and the second value or reflected at the reflectance of a larger value out of the first value and the second value by the half mirror,
• the imaging element is a short-range TOF sensor used to measure a short range that is a distance range from a short-distance minimum value to a short-distance maximum value,
• the other imaging element is a long-range TOF sensor used to measure a long range that is a distance range further than the short range and is a distance range from a long-distance minimum value to a long-distance maximum value,
• the processing unit includes
• a measurement range determination unit configured to determine at least which of the short range and the long range distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in on the basis of a signal indicating the electric charge accumulated in the first imaging element, a signal indicating the electric charge accumulated in the other imaging element, and a preset determination rule, and
• a distance data output switching unit configured to output first distance data calculated by a first distance data calculation unit in a case where the measurement range determination unit determines that the distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in the short range and output second distance data calculated by a second distance data calculation unit in a case where the measurement range determination unit determines that the distance between the three-dimensional video imaging device and the subject measured by the three-dimensional video imaging device is included in the long range.